... screw shape can be optimized to produce a similar amount of lift forceModern drones produce a high-pitched buzz sound as the propellers cut through Въздухът.
Хеликоптерният Дизайн - Новини
... screw shape can be optimized to produce a similar amount of lift forceModern drones produce a high-pitched buzz sound as the propellers cut through Въздухът.